Abstract
In the title compound, C22H21FNO3P, a 1,3,2-dioxaphosphinan-2-yloxy derivative, three 0 atoms are bonded in a trigonal pyramidal manner to the P atom. The exocyclic P-O bond is significantly longer than the two endocyclic P-O bonds, viz. 1.6678 (12) angstrom compared to 1.6046 (13) and 1.6096 (12) angstrom. The six membered ring which includes the P atom has a chair conformation. The fluorophenyl ring is inclined to the naphthalene ring system by 24.42 (7)degrees. In the crystal, molecules are linked via CH center dot center dot center dot pi interactions, forming slabs lying parallel to (10 (1) over bar).